I'm redoing my exhaust system front to back with the following parts

Hedman shorty headers
Hedman Y pipe (from what i understand it's 2 1/4 to 2 1/2)
Walker 46669 exhaust pipe (Will be cutting out where it necks down to 2.5" at muffler and using a 2.75 to 3" adapter for muffler)
Magnaflow 12267 muffer (3" inlet)
Walker 43244 and 43243 stock style 2.5" tips


The cat I want to use is a Magnaflow 54959 -- 3" spun flow (ceramic) Is it too big? Do I go
down to a 2.5"?

***EDIT*** If staying 3" might use a Magnaflow 53009 instead

Car is a TBI zero engine mods for now. Eventually getting World heads and LT1 cam (they were free lol)

Thanks!!

 

Do the Hedmans have a bung for your O2 sensor? Might wana check seems like they didn't. Hookers have a good fit to them from what ive gathered. Id use 3in on EVERYTHING I could on these cars the exhaust chokes em out IMO.

 

They were on my buddies IROC he had the bung welded. I'm leaning towards the 3".

 

Always go 3" cat and cat-back on a stock or close to stock V8 - regardless of what anyone else tells you.

 

Yeah, I ended getting the 3". A Magnaflow 94109.